PLATE XVIII, 
Transverse sectio ns of Echinoid Radioles. 
Pag. 
454. Racliolus complanatus, from St. Cassian (Brit. 
Mus., E 10103), X 30 diam.224 
455. « Cidaris » Roemeri, from St. Cassian (Brit. 
Mus., E 10104), X 30 diam.224 
456. The same, a small portion enlarged, X 90 diam. 224 
4f>7. Radiolus lineola major, from Jeruzsälcmhegy 
(Brit. Mus., E 10105). The darker areas 
are the only parts at all clear, but the rest 
is restored, partly on the evidence of an- 
other section; x 30 diam.231 
458. Radiolus lineola minor, from the Quarry near 
Cutting 1 (Brit. Mus., E 10106). Part of 
the section, being rather more obscure than 
the rest, has beeil left blank. X 30 diam. 232- 
All ligures were drawn from the sections by G. T. Gwilliam, under the Author’s direction, at a magnification 
of 120 and 40 diameters respectively, and were reduced by photography to the present scale. 
